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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596ccb580e3a178cbd1257a31ec2ae39aed95c559af856db5ec2675e5d54b6d0' 
  AND token = '184QT/VqVePNyLlqnMmfAx93p5LVZwn5mwrKm9RzpTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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