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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7f055226561ec7acb49fcda2625b98fe4c7ede2391c7dda0fd324656067956' 
  AND token = 'aioPqeelFjlo13uIDGXVd/6OKbNL7hdtGGdYwIFMq2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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