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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd935bdf65237bb370818a24c6bec1e85b9da084bcba8cce26e657fbe4a5e7ab2' 
  AND token = 'dLlvUhFOh1fW5rpryGgBQJfM2wL6u2Aed1BXjFnMxlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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