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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5462de56f17c106a7f4667e57abafb9c70889699275e35f85c48c56938c44e44' 
  AND token = 'K79YMb7u2WR6ujsy5aEsRGNY9XACoTb7g2hRgv4ynv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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