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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b21764606d703413ec06968ff333634040093dac76a5ce86d98aacd5bb4339' 
  AND token = 'YIOzi65iS4WC1BfqDHmIj4Snl8Di8ey5PQy97oyRqBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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