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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac53ebe6bf2077e99afd09b19fde837f7b778c19c0e6bb4d5f84c4e2d5781f53' 
  AND token = 'EVabyMrJ6EYA3+6HLCSG+QDGaom1NeXoV5j0Dj1b3iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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