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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e2f7d919ec6f7b1763493f5d79c1903bce31661aea5e34728717a16e59dbc5' 
  AND token = 'Pa4OBh3SHh9qPidKtKMl1Pe0Fs1nkaWTrziKgVOq6oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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