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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b62c55ac0dee24060d5e446bdfb390c17b8d9e4ade5cca8e047416db0202bca' 
  AND token = 'lphIRLImuyK4lbMnl9t6EAHyz1XsnP8R7jK6O4FxZV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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