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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09db6828cb0b8cc88cd9539909e124be85ba05e7c9717b4d98d28bf1c2775b0' 
  AND token = 'GhWWHOKkejMB//mK92NE3s8jNhlnH1HzghGzFuooPsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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