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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4c3c29479d3fc49abc304eb2f1c1ac1e7f804c8c5406c195dfbd2310eeee7b' 
  AND token = 'r+DvAXA1fB36+uYsLmwGxTIxCAwQOIs3UlZL5z+beqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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