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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354ab86e8fabde50df76c6c99d15a72b0f677de6aa23432017861f88f046542d' 
  AND token = 'bYIxCrmtAV+0jl3TojpocEETDeZ8znLcMvroOV8tDt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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