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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b8531973abe58cf87ae82469668f92e33d1e3e08973330ab4926288f2df9b2' 
  AND token = 'cp8f+vwSu7GXjTzAj0JLyzpe43miSUkpZh6afb4wxuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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