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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e21d480e0fffa5b1a8c7e25e75c4bfb344c3b261505d6eba8dd6ea3285606f6' 
  AND token = 'vmojRqvCxVpLpvo5Csm9xyGQYi3XfLj2V+SSAEzFF0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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