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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8825aa006161e0e8372fd0a5b0f308c4651e8eb452fa14c5f18d2476bc26aa52' 
  AND token = 'mmDkCyLnis/5eskrpz/lw7ktVydMR34SBksSttKUCdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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