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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb4d2c7b6a08a316c5680375a5d085c132acc821e1985c6ee06380e3644adf8' 
  AND token = 'LgS4YU6eFsMpwpK63YzLh1RKbCYf96gg86b/kW1Fkk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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