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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cd9fa2abe946347e968bac01d71a71b1b65c0650cf98f9e9f7fa344152af90' 
  AND token = 'Mf3r1hV9uV6yNOg3UR936dPfxWiyCjf9oUWw7W3o1Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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