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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c64d8dd1c950470ff3af32d0e876d2c1ccf7bd9485977613b29cd4d6947d2d' 
  AND token = 'tM3nBC3mkEy7w+P9v2PLXIoF50NtLkY3fz2WkePz2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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