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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0155c0ee5c3b85ad15e9a9e73644d1c6bbe47b7f3ea933c8384b1d7b2a75eb0' 
  AND token = 'FTMTCCFHaVLWBMRWwZf4erWknG2iQuJuegnLg0UU4X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00214

JSON explain

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