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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a461078216e550a93b394e593eaab9ebb698af4aa52e753c0e39a7a02a611e88' 
  AND token = 'Bust6va6Pm7MRsZkKc2C0AJSUz36hQ7BtH9xVLTKDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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