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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939d8c12cfb0d075dbf27102e49f05c7cf3553092fc21225d9744c6758316ca2' 
  AND token = 'penVsCa6CvoC/4hZKVpZB2ABPa1mlfSc6d7QjHCHXUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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