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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b14f0612f1b7ec26c8ac6312044e48932712989620fd1044440475aaeb19cf' 
  AND token = 'fT05fxJ2SX3GjOcgOahGc4sxmtkEd78oBsaUI9Vzei0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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