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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23caa7d6a4435600e52589af52d679cbcd224d6b16451da83af1ccc1d6721af0' 
  AND token = 'tkeGUhXcDpuB7ORsa06oRugvgU0Ub8Lcw8u82/Zn9PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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