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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ba80682a7c497efe8bd6fe505731449c80ca9eb83ef32af2923ae752179fd1' 
  AND token = 'DsgKebCLAVG5y3u+iUmPthpBNaY5Jg7tZehZB3QEebk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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