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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590fecabf042d8d03f0830902d150393d200af2002336947a73bfb51770349ac' 
  AND token = '/AOCIrr6VCioZFMd+vj/5/tXayhxXJfLgReSBKFns3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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