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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd592b7c6bf529d9c49d630cb5f0e64c85acd63e2a849d880087db5306011232b' 
  AND token = 'o+Nch2scQgZcA9cxefltFa4/v04+/MZpXweQ8Zqjnm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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