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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da93f133bc8504998a2bb419f428e375598ff6019283788286faf4c8d1434ca' 
  AND token = 'o3KdugAzkBUw0KWruNU6tpSNyF0C/9cqwWWY6iED1bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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