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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9799d1ed26e7d43b4bf429365e44d4cabb80a8adb0a45a0a2b7fd7232ffc5c9e' 
  AND token = 'EO39a8u0isb32ClGQId8bK9LBcZTej7g+v+iljUCiOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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