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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688939c53711e0fa0259834507abd59abcacd0db8413c6a80596df36e0f44a70' 
  AND token = 'BLv7+GLBFRpKqAE7N8M1t9oUeVj+oR8JHT3eixmqpH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}