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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c98e8c496616cb715ed7e1a007107d417b4bc415b43b50df9de3c14ed6b38bf' 
  AND token = 'Pqb/2SjH05qpaMzmztpsAwp+SPN2/XORGJj42PxEzs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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