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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5a0a601eb53caf438fe96ec22c6977d67f371a9da099aa2374333380c56fd4' 
  AND token = 'iSdjmEZ1BYWCvmLWibQTv+jALTfcRj9Yp75o7mW7NUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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