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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fefd379d5d744a9fa5274a40ecb248f0cbfd779dc6fbff8db51e22ebfa33a9' 
  AND token = 'gNKSSbL+6Tp/I17KueApDZfzYd6UrGcsn7oSqUbDLmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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