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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa62834df3e2c3b8d7c354c63f4fb81d84bf1ddb9ea519665e021811694b434' 
  AND token = 'tzEwyQs0vUJ25J/+WBH9adWmoGi2zl4e14k0DpjIDPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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