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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee3e0cf8c775039a5db0169f0b9e13ac3f45c9021e5f1ea880d77aa0ebbd025' 
  AND token = 'SkKuhzNKlv74qYgk0VeMS41AHfVY+E820u0oD4Skf3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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