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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17f807a180dc326a4b8c167a6ef18da55c1574c8bb664a610aa52c68860268f' 
  AND token = 'yliQbZB2h02qBELXygIJs0Q6Ai35MZdwEXLmkwAyZCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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