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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11eea39a81aa9e827915ed299be2bedfde399ed919b84b1d1ae3b540aede2d43' 
  AND token = '2T6/y9eVfPTZGrfgoM3C98I+fYYf45F52QpT5ZRnP2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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