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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbeff03024efe8ce31eabc2ec528578ab8d99d0edcb6dd7f345b988d7e0a28e2' 
  AND token = '81OySr3S77z9iFOMYUv2bMRcxZ4r/VBxzUVh4HeI8rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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