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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69220aaf3f1cbaf9ee36dda7343fbdc79b9dd7ca252075178b0b5a177dd3e9eb' 
  AND token = '0YpJmYCYeqU11IT9ZE55iWISy6i4bArUaA6chUDLbRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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