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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423ac941c92dbefcd15335eafc52e1da9d752bdeb127c5b9449548022d59d7f2' 
  AND token = 'hwjuskhx8J5ls60f4ajJNVzMOiCoJ5EpNXNSW7Kx1Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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