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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0caa90de41277e5c6f88d5214c23edb3bc8734b16f13fb8c34dff5db69bf847' 
  AND token = 'vQU6QsvEq9e3KZpO63RfFtAiP3aK6f+Ww0rZmgwUv+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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