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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2bc623b62a28b61bc88cb3e134cf84cb05f29266f417861fba7cb9ecd791df' 
  AND token = 'EmDi1oBjcD8iQ52Ave6omM/DsE7FAN1JMt31Zo6o7FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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