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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4a67853c306be21e9250dff0674d85e5faf214261549f1cbba7e63995bc108' 
  AND token = 'nsAh7Y56825xfhCCmW9jKdZj9zBtuzdjBS5dGLo76Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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