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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69ccf0ed41f152a0b342eb03e8819b6b150a7d54aa91f72edd0f9bbec7e1874' 
  AND token = 'S0Vo6s+q08LPDfyDcgFNIzalsgUY2AH25CXjX9uiG9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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