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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460de15fb57663fc656f4d664dd4b3723a949b3b3e6d8396795288d404e6b584' 
  AND token = '3H0Ql+R1ZCdyp02paxuM1+4RsAp+FpqUU/UxqaYDW94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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