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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261188156531dfa568847b9266c3eb071e6f1b72c11151c012b043ae12b32b58' 
  AND token = 'iuPvdXp0E6Q9twehlWmf3KdFqFxfJaHJSxxUBT5xGEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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