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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6290a8626d53b98ee2aa5a2f2d70bf3ba70f17107bb5da94697026504307d9f0' 
  AND token = 'KUALked9qlJklQqOybVddUlXhSnrYeIYyF2sYvMqKrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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