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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baa03097e1aa7a41de0bc2b25278a272e688bb48f6290bbe4617e06c27315e3' 
  AND token = 'J4EuEPgBCPO+dqaefq3drPxYatBoV5TRqqqKtH6IW0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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