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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e13cad04147a35615396b0a314352b6c3e7d6b6dba823307130a4c1a1c2c93' 
  AND token = 'q374FVtzJCRqNIO4wB9LIFIxJSzrxjzZPSg2ld6bR+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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