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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6f07766f857696ab5dbf70493964d0beaab97cb77b7e80a46960a0cc61165b' 
  AND token = '9i0S7jOt07jrfflTuSeTbZeerpHgeF7jwgr/aWGptRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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