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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aee858d8cafbec3968a1e7985c8f9b864e943087d82807e18e04bb1bacff48b' 
  AND token = 'Bd2SPi+fjzfgvbFGX6Vi3pc6QpoUnm0pn90ZJljRz9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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