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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e2d59053c8ad1cd949edf5e54d6c9874ac71d7ae8e60624bccf62763a301d6' 
  AND token = 'XUuClCT9rsWWc8/IA10lUEdGTyJbDkSlxeFXgbihnbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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