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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d74d168039fe23e7ada5ac2fc2234a697be41abda7362573aeb14ecac1bf0e7' 
  AND token = 'pv8E6T1InpCC68QaqRzASYgOOanPc5D5Rg4ezRTQiVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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