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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e424c56e6ba146d9111119354f74c86a5efda2ea95fb8576de6bfddc2a43cb62' 
  AND token = '67abDvhw29UsIQYYphYYLA9nxtQsyC82r2wGCvC4p88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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