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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d66ba47ae4f474b767a245859f35e010ba53dbd59d337f672bed3a08f6a418e' 
  AND token = 'ZsNr/IzrwDrzVdAXqS0NmVZjwr0qHG4do1NtZe54BWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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