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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55daeb725819c3ac234dace4e930d53e07e9868e8a0c57a7d50e20c98b8d4d9c' 
  AND token = '+qUZr0KuQlkJ+8iJBK0PSc3q9wqy12anQyrFJT67hqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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