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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24761dde37da8e634da03bdc08fa0000ed9b2a1ce8cef8fb6c2f187b3ad770ae' 
  AND token = '9IuaD3qqbAGQ+FzdT3pyY0B0OXFFrAVL5pACnmdxxFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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