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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0671ad40ee46a103e57a4a48b956f1562e9d80264b34e58aa227c2caba96cb0e' 
  AND token = 'euPTwXzzOL8m4uAKesnjnHBAOwr7wKTcPyJk+MoM80M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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