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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcfaf70931d2654108950a4fbc291e0a328ed98aed08d82312cbd284257574b' 
  AND token = 'Al42F8xRXjH1DpHicavM6ktkiVvKL0bq5R31gfKiv1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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