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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f866a856362aafd771f55237d03578755ab53195b1e3f2b3a3a719ea699d64e' 
  AND token = 'vxbV7KKG99vmCwK2XGg2m0K1EeLq20Oh6kJUw+XUk7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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